Wellington Exposure Disc - Antique and Vintage Cameras

Wellington Exposure Disc

c. 1909

Wellington & Ward Ltd

Elstree

England

Image of Wellington Exposure Disc

Meter Type:
Calculator.

Calibration:
Plate speed: 6 - 500 H&D. Shutter speed: 1/350 - 3h. Aperture: f4.5 - f64.

Attributes:
Settings for - Time of day, month. Sky condition. Subject.

In use the light value is taken from a table showing month and time of day. The sky condition is set against the light value. The subject or weather condition is set against the plate speed. The shutter speed and aperture pairs can then be read. Shown at the RPS exhibition in 1909.

References & Notes:
BJA 1910, p. 253.

Cheape

Expodak Co.

Charlottesville

USA

Meter Type:
Calculator.

Calibration:
Shutter speed: 1/100 - 12s. Aperture: f5 - f45, 2 - 128 US.

Construction:
Plastic.

Attributes:
Settings for - Time of day, time of year. Subject.

With:
Envelope.

In use the light value is found from a table based on month and time of day. This value is set against the subject type. An arrow will then point to a value, that value is moved to align with the plate in use. The shutter speed and aperture pairs can then be read. The instructions recommend that a strip of Solio paper is used as an actinometer to get the light value rather than use the table. John Albert Cheape also designed an actinometer around 1899.

References & Notes:
BJA 1900, p. 845 (earlier actinometer by Cheape).

Posometer

1928

Later model by Ensign

Ensign Ltd

London

England

Meter Type:
Calculator.

Calibration:
Film speed: 100 - 500 H&D. Shutter speed: 1/1000 - 11h. Aperture: f3.4 - f16.

Attributes:
Settings for - Time of day, time of year. Weather conditions. Type of subject.

Notes:
Address on instructions: Ensign Ltd. London. WC1.

With:
Instructions. Case.

This is a simple dial type calculator with easy-to-use finger notches, the design was later used by 'Johnsons of Hendon' for a range of similar calculators. A cine version of the Posometer was also available as were models in French and German.

References & Notes:
Phot. Journal 6/1928, p.258. Westminster Cat. c. 1930, p. 38.

Exposure Records

c. 1910

Wratten & Wainwright Ltd

Croydon

England

Exposure records for 12 plates. Includes filter factor table and developing formulae. Issued with Wratten & Wainwright Panchromatic Plates.

These are for the photographer to record exposure details, subject and any additional notes. Plate manufacturers would often include a card in the box of plates giving details of the plates and space for the exposure details to be recorded. Photographer's diaries also had several pages to record the details. Some cameras, typically magazine types, had ivorine plaques which could be written on. Wratten introduced these plates in 1906, in 1912 they became part of Kodak.

Tables & Calculators

H&D Actinograph

Phillips
Dibdin's Automatic
Lambert & Cadett's
W. Tylar

Ilford Meter

Imperial Exposure Reckoner

Griffin's, Smith
Voigtländer, Agfa, Lindner

Imperial, Ilford
Dufay, Kodak

Wellington Exposure Disc
Cheape, Posometer
Exposure Records

Posographe

Wellcome Calculator

Nebro, Fotogram
Pathéscope, Lighting Guide

Johnson's


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